6 bolt Disc Rotor E Bike Magnetic Sensor Rear Mount Tektro inward magnet
The TR02 magnetic speed sensor is compatible with all 6 bolt TRP and Tektro rotors as well as several other brands like Shimano and Sram/Avid Distance from centre of axle to centre of magnet is 33mmMagnet toward inward design. Thank youGeelong Bicycles